[SOLVED] what is the use for USB passthrough port plug in on Corsair K70 Dual USB 3.0 or 2.0 ? and where in back of my computer does it plug into ?

[fedace]

also how do i know which hole is 3.0 and which hole is for 2.0 ? thank you

 

[davidgirgis]

by hole, I think you mean USB port.
I don't think it matters much for a keyboard. Any USB port should work.

 

[hang-the-9]

also how do i know which hole is 3.0 and which hole is for 2.0 ? thank you

Use is same as any other USB hub, so you can connect things to the device without having to connect them to the computer directly. What is USB 3, most USB 3 ports color coded blue. Keyboard would plug into the USB ports on your computer. If you want USB 3 speeds on the ports you would need to connect to USB 3 port on your computer.